Welcome Julian, your right a bunch of very dedicated bowhunters on this site. Sometimes we agree, sometimes we dont, everyone has their opinion. One thing no one will argue
With is the amount of talented craftsmen on this site. Check the Sponsors Classifieds, there are several Custom String builders there any one of them can fix you up with exactly what you need.
As far as arrows, I'd start out with carbon. They are tough and you can get them pretty close Spined. Check out Big Jims
Bowhunting, also a sponsor here, he sometimes sell carbon seconds at a great price, good guy to deal with also. You didn't
Say how long your draw is, this will sometimes affect the correct arrow spine if it's overly long, again just talk to our sponsors they will make sure you get what you need.
And don't forget about Three Rivers, even though they are a large distributor, they are not so big you can't call them for advice, again good folks as well, as you say you have ordered from them before.
Good luck, you will enjoy the Traditional side of Archery, not the easiest, or the fastest to learn, won't shoot the highest scores or the farthest , but unmatched for sheer self satisfaction and enjoyment.
RW